drm/i915: add prefault_disable module option
prefault is stll enabled by default which prevent most of pwrite/pread/reloc
from running slow path, in order to verify these slow pathes, prefault need
to be disabled.
Signed-off-by: Xiong Zhang <xiong.y.zhang@intel.com>
[danvet: Make checkpatch happy and bikeshed the module option help
text a bit.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index ce043f1..acc99d4 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -465,7 +465,7 @@
mutex_unlock(&dev->struct_mutex);
- if (!prefaulted) {
+ if (likely(!i915_prefault_disable) && !prefaulted) {
ret = fault_in_multipages_writeable(user_data, remain);
/* Userspace is tricking us, but we've already clobbered
* its pages with the prefault and promised to write the
@@ -860,10 +860,12 @@
args->size))
return -EFAULT;
- ret = fault_in_multipages_readable(to_user_ptr(args->data_ptr),
- args->size);
- if (ret)
- return -EFAULT;
+ if (likely(!i915_prefault_disable)) {
+ ret = fault_in_multipages_readable(to_user_ptr(args->data_ptr),
+ args->size);
+ if (ret)
+ return -EFAULT;
+ }
ret = i915_mutex_lock_interruptible(dev);
if (ret)